Custom fields allow you to add additional information to several types of data used in Redmine. See 'custom field types' for all types of data which come with support for custom fields.Each custom field can be defined to be of a certain type.

You can create your own list of values which you want your users to add. A posteriori change in values of "List" type will not affect any existing records created in the past, while a change in values of "Key/value list" will also affect existing records created in the past.

Note: issue priority custom fields are not (yet) used in the Redmine core, though other plugins or themes can/may use them. No setting here has any effect on any other parts of Redmine for the time being.

Note: document category custom fields are not (yet) used in the Redmine core, though other plugins or themes can/may use them. No setting here has any effect on any other parts of Redmine for the time being.